What is the most accurate test for anal fistula?

Written by Yang Dong

Colorectal Surgery Department

Updated on September 28, 2024

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As a common disease in proctology, simple anal fistulas can be diagnosed through visual inspection and palpation. For high-positioned complex anal fistulas, which cannot be accurately assessed through just visual inspection and palpation, the use of instruments may be necessary. Currently, magnetic resonance imaging (MRI) is recommended as the most accurate method for evaluating anal fistulas, and it is considered the gold standard for examining the course of the fistula tract and the location of the infection.

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Written by Chen Tian Jing

Colorectal Surgery

49sec

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Does an anal fistula hurt?

Anal fistula mainly refers to the presence of a noticeable fistula in the tissue under the perianal skin, which connects the inner opening in the anal canal and the outer opening around the anus. Usually, the anal fistula does not cause significant pain when it is not in acute flare-up. However, if the anal fistula enters an acute episode, there may be pain due to inflammation at the local external opening of the anus, and possibly an increase in purulent discharge, which can irritate the skin around the external opening, causing stinging pain and itching. To prevent recurrent episodes of anal fistula and further aggravation of the condition, it is advised to seek surgery as soon as the fistula is detected.

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Written by Chen Tian Jing

Colorectal Surgery

1min 3sec

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What should be paid attention to for anal fistula?

Patients with anal fistula, as there is an external opening in the anal region and intermittent thick secretion from this opening, should first ensure to keep the perianal area clean. It is recommended to change underwear daily and to cleanse the area after bowel movements with saline or hemorrhoid wash, and to conduct fumigation and hot compresses around the perianal area and the external opening to prevent irritation and even sharp pain caused by residual feces and secretions. Furthermore, during acute episodes of anal fistula, mupirocin ointment can be applied around the external opening for anti-inflammatory treatment. The definitive surgery for anal fistula primarily involves fistulotomy with seton placement. Without surgery, an anal fistula cannot be completely cured and may lead to worsened conditions such as thickening of the fistula wall or increased branching of the fistula channels.

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Written by Chen Tian Jing

Colorectal Surgery

1min 6sec

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How long does it take to recover after surgery for an anal fistula?

Healing after surgery for an anal fistula requires some time, and the longer healing duration is mainly related to two factors: The first reason is that anal fistula is a localized infectious disease of the anus with the presence of a fistula. The principle of surgery is primarily to remove the fistula. Therefore, after the surgery, the wound surface from the removed fistula wall is relatively large and requires time to heal. The second reason is that the local area around the anus is a contaminated wound, with feces passing through daily. Feces are a significant source of contamination, so the wound healing is influenced by the irritation from feces, resulting in a non-sterile wound environment. Consequently, the wound healing rate after the surgery is slower compared to the healing rate of sterile wounds in other body tissues. Therefore, the recovery time after anal fistula surgery is approximately 3 to 4 weeks.

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Written by Yang Dong

Colorectal Surgery Department

33sec

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What will happen if an anal fistula is not treated?

An anal fistula is a chronic fistula and duct caused by an infection of the anal sinuses. If not treated, an anal fistula may repeatedly flare up. The consequences of repeated occurrences can lead to abscesses, peripheral spreading, and eventually extensive spreading of the loose tissue around the anus, which in severe cases may damage the anal muscles, leading to anal incontinence. If an anal fistula persists for a long time, there is also a possibility of malignant transformation.

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Written by Yu Xu Chao

Colorectal Surgery

1min 11sec

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How to reduce swelling when an anal fistula flares up?

An anal fistula flare-up can cause perianal swelling, pain, and discharge of pus and blood. For an anal fistula flare-up, initial conservative treatment with medications is an option, such as sitting baths using anal cleansing agents or potassium permanganate solutions after defecation. The sitting bath should last between five to ten minutes to help reduce swelling and relieve pain. After the bath, topical application of mupirocin ointment or other anti-inflammatory ointments like Golden Ointment may also be used to reduce swelling and inflammation. For severe infections, intravenous or oral antibiotics may be prescribed to reduce inflammation. However, clinically, it is recommended to opt for surgical removal of the anal fistula as early as possible. Early removal of the internal opening and the fistula tract is necessary for a complete cure of the anal fistula. If an anal fistula repeatedly flares up, it can easily lead to the formation of more fistula branches, forming complex anal fistulas, increasing the difficulty of later surgeries and enlarging the wound surface post-operation.